Causes and Solutions for Windows 11/10 Error 0xC1900101 | How to Fix Windows 10 Upgrade Failure on Your Own

Have you ever experienced the error code "0xC1900101" suddenly appearing and being rolled back to the original OS while upgrading to Windows 11 or during a major update that adds the latest features?

This error is a sign that the upgrade process has encountered a serious problem, and it has caused many users trouble.

In this article, we will identify the main causes of the error "0xC1900101" and provide comprehensive explanations of specific solutions, from basic to advanced, that even beginners can try step by step.

What is the error "0xC1900101"?

"0xC1900101" is one of a group of common error codes that can occur during the Windows upgrade or installation process.

The underlying meaning of this error is:A driver-related issue caused the installation process to fail and the system to roll back to the previous version"about it.

The upgrade process involves verifying that the new OS can work properly with your existing hardware. If an incompatible device driver is found during this process, the process will be interrupted to protect your system and return it to its original, stable environment.

Error 0xC1900101 details

Other possible causes

Driver issues are the main culprit, but errors can also occur due to a combination of the following factors:

Important preparation before trying the solution

Before proceeding with the specific solutions, please make sure to do the following two preparations. Failure to do so may result in the loss of important data.

1. Back up your important data

During the troubleshooting process, there is a chance that your system may become unstable or even fail to boot. Before you begin, be sure to back up any data you don't want to lose, such as documents, photos, and work files, to an external hard drive or cloud storage.

• [Windows 11] Back up your entire OS for free! Completely restore your PC with your own "custom installation media"

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To avoid panicking if your PC suddenly breaks down, it's a good idea to have a standard backup software to protect your important photos and data.

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2. Review the minimum system requirements for Windows 11

Double-check that your PC meets the minimum system requirements for Windows 11, especially the requirements for "TPM 2.0" and "Secure Boot."

The most reliable way is to use the "PC Health Check App" available on Microsoft's official website.

• Microsoft – Check Windows 11 specifications, features, and computer requirements

Open the page above and click the "PC Health Check" link to download "WindowsPCHealthCheckSetup.msi."

How to use the "PC Health Check App"

1. Run the downloaded "WindowsPCHealthCheckSetup.msi".

2. The setup screen will appear. Check "I accept the terms in the license agreement" and click "Install."

3. Once the installation is complete, simply click "Finish".

4. The PC Health Check app will open, so click "Check Now".

5. If you see the message "This PC meets the requirements for Windows 11," then there's no problem.

If you don't meet the requirements, you'll see the message "This PC doesn't currently meet the Windows 11 system requirements."

Step 1: Basic Troubleshooting

Let's start with some basic solutions that anyone can try, and in many cases these simple steps will solve the problem.

Solution 1: Disconnect all unnecessary peripherals

Please minimize the number of USB devices connected to your PC (only a mouse and keyboard). Disconnect all of the following devices and then try the upgrade again.

• External hard disk, SSD
• USB memory
• Printers and scanners
• webcam
• Smartphones, tablets
• USB hub
• game controller

These devices may be interfering with the upgrade through incompatible drivers.

Solution 2: Free up enough disk space

A minimum of 20GB of free space is recommended for upgrading to Windows 11. If you are running low on free space on your C: drive, use the "Disk Cleanup" or "Storage Sense" features to delete unnecessary files.

• Reveal hidden Disk Cleanup items to free up disk space

Solution 3: Turn on Memory Integrity

If your PC has incompatible drivers installed, you won't be able to turn on Memory Integrity, which means that turning on Memory Integrity will clear the root cause "Device driver incompatibility is the main cause."

• [Solved] Windows Memory Integrity cannot be turned on! Causes and Solutions

Solution 4: Temporarily Disable or Uninstall Third-Party Security Software

Third-party security software such as Virus Buster, Norton, and McAfee may conflict with the upgrade process due to their powerful protection features.

First, try temporarily disabling the protection feature. If the error persists, try uninstalling it completely and then upgrading.

After uninstalling, the standard Windows "Microsoft Defender" will be automatically enabled, so there is no need to worry about being left unprotected. Please reinstall it after the upgrade is complete.

Step 2: Repair your drivers and system

If the basic solutions don't solve the problem, it's likely that the underlying cause of the error is a problem with the driver or system files.

Solution 5: Update Windows Update

Before attempting an upgrade, make sure your current OS (e.g., Windows 10) is up to date. Microsoft frequently provides drivers and fixes to resolve compatibility issues via Windows Update.

1. "Windows Update" Open
2. Click Check for updates and install all available updates.
3. We also recommend installing any optional updates, especially driver-related ones.

Solution 6: Update Device Drivers

Use Device Manager to manually update drivers, especially those that are critical or prone to problems.

1. Right-click the Start button and select Device Manager.
2. Focus on the following items, right-click each device and select "Update driver".
   • Display adapters(Graphics board)
   • Network adapters
   • Storage Controller
   • Sound, video and game controllers
3. Select "Search automatically for drivers" and install new drivers if found.
4. If there is a device with an "!" or "?" mark, it is very likely that this is the direct cause. Please update or reinstall it as a priority.

A more reliable method is to directly download and install the latest Windows 11 driver for your model from the support site of your PC manufacturer (DELL, HP, NEC, etc.) or graphics card manufacturer (NVIDIA, AMD, Intel).

If you don't know where to download it, leave a comment and we'll help you find it here. Be sure to include your PC model number.

From the Windows Update advanced options,Receive updates for other Microsoft productsYou may be able to download the latest driver by checking "

Solution 7: Update BIOS/UEFI

BIOS/UEFI is a critical piece of firmware that acts as a bridge between the OS and the hardware. If it is outdated, it can cause compatibility issues with newer OSes like Windows 11.

To update the BIOS, go to the support site of your PC manufacturer. Search for your PC's product name and model number to see if the latest BIOS is available.

Notes: Updating the BIOS/UEFI carries the risk of causing your PC to become unbootable if you do it incorrectly. Be sure to follow the manufacturer's instructions carefully.

Solution 8: Check Disk for Errors and Repair System Files

A Windows upgrade will not be successful unless your storage (HDD/SSD) and system files are in good condition.

Here we will perform a "disk error check" and a "system file repair".Be sure to run the steps in order, starting with "Disk Error Check."This is because if there is a problem with the disk itself, it may cause system file corruption, so you need to first restore the underlying disk to a healthy state.

First try to resolve any disk errors, then try to repair the system files.

• Check your HDD and SSD for errors regularly in Windows 10/Win11
• Repairing system files in Win10/Win11 with "System File Checker"

Step 3: Last resort

If you've tried all the above solutions and are still experiencing the 0xC1900101 error, you'll need to try installing in a cleaner environment.

Solution 9: Upgrade using installation media

Instead of upgrading via Windows Update, you can download the "Media Creation Tool" from the official Microsoft website and perform the upgrade from a USB memory stick or ISO file.

The advantage of this method is that you can use the latest installation files and the process is more stable because it does not depend on an internet connection. Boot your PC from the created USB flash drive and select the upgrade installation. (If you select "Keep personal files and apps," your data will not be lost.)

How to Use the Windows 11 Media Creation Tool | Error Troubleshooting

Solution 10: Clean Install Windows 11

The last resort is to perform a fresh install (clean install) of Windows 11 without inheriting your existing environment.This will delete all data, settings, and applications on the C: drive.So be sure to take a complete backup before proceeding.

A clean install can be performed using the installation media created in Solution 9 or an ISO file downloaded from the official website, created with a dedicated tool such as Rufus. On the installation type selection screen, select "Custom: Install Windows only (advanced)," format the existing partition, and then perform the installation.

• How to download Windows 11 ISO files
• Complete steps to create a Windows 11 installation USB drive using Rufus

Summary

The Windows 11 upgrade error "0xC1900101" is mainly caused by device driver incompatibility. If you encounter this error, don't panic. The quickest way to resolve it is to follow the steps below.

1. Advance preparation: First, make sure to back up your data and double-check the system requirements.
2. Basic measures: Try simple, low-risk methods such as removing unnecessary peripherals, freeing up disk space, and disabling security software.
3. Driver and system repair: Approach the root cause of the error by running Windows Update, driver updates, BIOS updates, and System File Checker.
4. last resort: Consider upgrading from installation media or ultimately a clean install.

In most cases, the problem can be resolved by following steps 1 and 2. It is important to follow each step carefully to isolate the cause of the error.

If you've tried all the steps in this article and still can't resolve the issue, your hardware may not be compatible with Windows 11, or you may have a more serious issue. In this case, consider contacting your PC manufacturer for support.

We hope this guide helps you to have a successful upgrade to Windows 11.

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